pbraun@nethence.com wrote:

> On some Apus2000 (C500) 603e/200 machine, 1.6.2/macppc cdrom boots fine 

3.1 is much better since 1.6.x is EOL.

> (boot scsi/sd@3:0).  But once installed, how to boot the system ?

boot CD, and type "s" to get shell
# fsck -p /dev/rwd0a
# mount /dev/wd0a /mnt
# cp /usr/mdec/ofwboot /mnt
# umount /mnt
# installboot -v /dev/rwd0c /usr/mdec/bootxx /ofwboot
# reboot

> Here's the best I get,

It's also better to post what commands you tried.
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Izumi Tsutsui